<template>
    <div>
        <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 警告区域 -->
              <el-alert :closable="false" title="注意：只允许为第三级分类设置相关参数！" type="warning" show-icon></el-alert>
              <!-- 选择商品分类区域 -->
              <el-row class="cat_opt">
                  <el-col>
                      <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                     <el-cascader
                    v-model="selectedCateKeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange"></el-cascader>
                  </el-col>
              </el-row>
              <!-- tab页签区域 -->
              <el-tabs v-model="activeName" @tab-click="handleTabClick">
                  <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table
                    :data="manyTableData" stripe border>
                    <!-- 展开行 -->
                    <el-table-column
                        type="expand" >
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag closable v-for="(item,i) in scope.row.attr_vals" :key="i" @close="handleClose(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引页 -->
                    <el-table-column
                        type="index">
                    </el-table-column>
                    <el-table-column
                        prop="attr_name"
                        label="参数名称">
                    </el-table-column>
                    <el-table-column
                        label="操作">
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-item" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                    </el-table>
                </el-tab-pane>
                  <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                    <!-- 动态参数表格 -->
                    <el-table
                    :data="onlyTableData" stripe border>
                    <!-- 展开行 -->
                    <el-table-column
                        type="expand" >
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag closable v-for="(item,i) in scope.row.attr_vals" :key="i" @close="handleClose(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column
                        type="index">
                    </el-table-column>
                    <el-table-column
                        prop="attr_name"
                        label="属性名称">
                    </el-table-column>
                    <el-table-column
                        label="操作">
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-item" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加属性/参数 的对话框 -->
        <el-dialog
            :title="'添加' + titleText"
            :visible.sync="addDialogVisible"
            width="50%" @close="addDialogClosed">
        <!-- 添加属性/参数 的对话框 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>

            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改属性/参数 的对话框 -->
        <el-dialog
            :title="'修改' + titleText"
            :visible.sync="editDialogVisible"
            width="50%" @close="editDialogClosed">
        <!-- 添加属性/参数 的对话框 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>

            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
    data() {
        return {
            // 商品分类列表数据
            catelist:[],
            // 级联选择框的配置对象
            cateProps:{ 
                expandTrigger: 'hover' ,
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys:[],
            // 被激活的页签名称
            activeName:'many',
            // 动态参数数据
            manyTableData:[],
            // 静态属性的数据
            onlyTableData:[],
            // 监听添加属性/参数 的对话框的显示和隐藏
            addDialogVisible:false,
            // 添加参数/属性 表单数据对象
            addForm:{
                attr_name:''
            },
            // 添加参数/属性表单的验证规则
            addFormRules:{
                attr_name:[
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },
            // 监听修改属性/参数 的对话框的显示和隐藏
            editDialogVisible:false,
            // 修改参数/属性 表单数据对象
            editForm:{
                attr_name:''
            },
            // 修改参数/属性表单的验证规则
            editFormRules:{
                attr_name:[
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            }
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList(){
            const { data:res } = await this.$http.get('categories')
            if(res.meta.status!==200){
                this.$message.error('获取商品数据列表失败')
            }
            this.catelist=res.data
            // console.log(this.catelist);
        },
        // 级联选择框选中项变化，会触发这个函数
        async handleChange(){
            this.getParamsData()
        },
        // tab页签点击事件的处理函数
        handleTabClick(){
            this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData(){
            // 如果选择的不是三级分类
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return 
            }
            // console.log(this.selectedCateKeys);
            // 根据所选分类的Id，和当前所处的面板，获取对应的参数
            const { data:res } = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            if(res.meta.status!==200){
                this.$message.error('获取商品信息失败')
            }

            res.data.forEach(item => {
              item.attr_vals = item.attr_vals? item.attr_vals.split(' '):[]
            // 控制文本框和按钮的切换显示
              item.inputVisible=false
            // 文本框中输入的内容
              item.inputValue=''
            });

            console.log(res.data);
            

            if(this.activeName==='many'){
                this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }
        },
        // 监听添加属性/参数 的对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮  添加属性 
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                // console.log(valid);
                if(!valid) return
                const { data:res } = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==201){
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                this.getParamsData()
                this.addDialogVisible=false
            })
        },
        // 监听修改属性/参数 的对话框的关闭事件
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 点击修改按钮 弹出修改对话框
        async showEditDialog(attr_id){
            const { data:res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
            {params:{attr_sel:this.activeName}})
            if(res.meta.status!==200){
                this.$message.error('获取参数信息失败')
            }
            this.editForm=res.data
            this.editDialogVisible=true
        },
        //点击按钮  修改属性 
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return
                const { data:res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name:this.editForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==200){
                    this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数成功')
                this.getParamsData()
                this.editDialogVisible=false
            })
        },
        // 点击按钮 根据ID删除对应参数
        async removeParams(attr_id){
          const confirmResult =await  this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)
        // 用户取消删除操作
        if(confirmResult!=='confirm'){
           return this.$message.info('已取消删除')
        }
        // 删除业务逻辑
        const { data:res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status!==200){
            this.$message.error('删除参数失败')
        }
        this.$message.success('删除参数成功')
        this.getParamsData()
        },
        // 文本框失去焦点 或者摁下了enter键都会触发
        async handleInputConfirm(row){
            if(row.inputValue.trim().length===0){
                row.inputValue=''
                row.inputVisible=false
                return
            }
            // 如果没有return，则证明输入的内容，需要做后续处理
            row.attr_vals.push(row.inputValue)
            row.inputValue=''
            row.inputVisible=false
            // 把添加后的参数保存到后台数据库
            this.saveAttrVals(row)

        },
        // 点击按钮  展示文本框
        showInput(row){
            row.inputVisible=true
            // 让文本框自动获得焦点
            // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
             this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 将对attr_vals的操作保存到数据库
        async saveAttrVals(row){
            // 把添加后的参数保存到后台数据库
            const { data:res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            if(res.meta.status!==200){
                return this.$message.error('修改参数项失败')
            }
            this.$message.success('修改参数项成功')
        },
        // 删除对应的参数可选性
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },  
    computed: {
        // 如果按钮需要被禁言 则返回true 否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length!==3){
                return true
            }
            return false
        },
        cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        titleText(){
            if(this.activeName==='many'){
                return '动态参数'
            }else{
                return '静态属性'
            }
        }
    },
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 0 10px;
}
.input-new-tag{
    width: 120px;
}
</style>